/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.google.android.apps.iosched.io;

import de.google.android.apps.iosched.io.XmlHandler.HandlerException;
import de.google.android.apps.iosched.util.ParserUtils;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.content.ContentResolver;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.XmlResourceParser;

import java.io.IOException;
import java.io.InputStream;

/**
 * Opens a local {@link Resources#getXml(int)} and passes the resulting
 * {@link XmlPullParser} to the given {@link XmlHandler}.
 */
public class LocalExecutor
{
	private Resources mRes;
	private ContentResolver mResolver;

	public LocalExecutor(Resources res, ContentResolver resolver)
	{
		mRes = res;
		mResolver = resolver;
	}

	public void execute(Context context, String assetName, XmlHandler handler) throws HandlerException
	{
		try
		{
			final InputStream input = context.getAssets().open(assetName);
			final XmlPullParser parser = ParserUtils.newPullParser(input);
			
			handler.parseAndApply(parser, mResolver);
		}
		catch (HandlerException e)
		{
			throw e;
		}
		catch (XmlPullParserException e)
		{
			throw new HandlerException("Problem parsing local asset: " + assetName, e);
		}
		catch (IOException e)
		{
			throw new HandlerException("Problem parsing local asset: " + assetName, e);
		}
	}

	public void execute(int resId, XmlHandler handler) throws HandlerException
	{
		final XmlResourceParser parser = mRes.getXml(resId);
		
		try
		{
			handler.parseAndApply(parser, mResolver);
		}
		finally
		{
			parser.close();
		}
	}
}
